sparks



(No Model.) 2 Sheets-Sheet 1.

. W. E. SPARKS.

LOCK. No. 480,973. Patented Aug. 16, 1892.

(No Model.) 2 Shets-Sheet 2.

W. E. SPARKS.

LOOK

No. 480,973. Patented Aug. '16, 1892 UNiTED STATES PATENT FFICE.

WILLIAM SPARKS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE SARGENT'dtCOMPANY, OF SAME PLACE.

' LOCK.

SPECIFICATION forming part'of Letters Patent No. 480,973, dated August16, 1892.

Application filed May 2, 1892. Serial No. 431,558- (No model.)

To all whom it may concern:

Be it known that I, WILLIAM E. SPARKS, of New Haven, in the county ofNew Haven and State of Connecticut, have invented a new. Improvement inDoor-Locks; and I do hereby declare the following, when taken inconnection with accompanying drawings and the letters of referencemarked thereon, tobe a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in

Figure 1, a side view of the lock, the covering-plate removed to showthe mechanism, the bolt being in the drawn position; Fig. 2, the same asFig. 1, with the bolt in the thrown position; Fig. 3, a vertical centralsection cutting on line 0c 00 of Fig. 1; Fig. 4, the same as Fig. 1 withthe tumbler removed; Fig. 5, the tumbler detached.

This invention relates to an improvement in that class of door-lockswhich are adapted to be operated by means of what are commonly calledcylinder-locks that is to say, a cylinder containing a key mechanismadapted to be secured to the case, the cylinder having a talon arrangedto operate to throw and draw the bolt as the cylinder is rotated. Itfrequently occurs that it is desirable in this class of locks to providethem with a cylinder upon both sidesthat is to say, so that the bolt maybe operated by a key from the outside and also be operated by a like keyfrom the inside-and as the cylinder on the one side can operate onlyfrom that side it follows that in such case two cylinders arenecessaryone upon one side and the other upon the opposite side. It isto the construction of a lock in which two such cylinders may, ifdesired, be employed that this invention particularly relates, theinvention having for its object a simple but effective tumbler mechanismfor the bolt, upon which the tang of the cylinder may operate, andwhereby the tumbler may be firmly supported upon and so as to move withthe bolt and afford two independent points of operation upon thetumbler, one for each side; and the invention consists in theconstruction, as hereinafter described, and particularly recited in inthe claim.

A represents the case, which is of usual construction.

B represents the cylinder as applied to one side, and C the cylinder asapplied to the opposite side, they being relatively one above the other.

D represents the bolt, which is arranged in the case and is of a yokeform, as seen in Fig. 4. One arm E of the bolt passes below the cylinderB, and a like arm F extends from the bolt downward and passes below theother cylinder C, the bolt riding upon a stationary support G, formed inthe case.

H represents the stump, which is also made stationary in the case, andthe bolt is constructed with a recess I in its upper side, into whichthe stump extends and so that the said recess limits the outward andinward movement of the bolt, one end of the recess coming against thestump H when the bolt is in the drawn position, as seen in Fig. 1, andthe other end of the recess strikes the opposite side of the stump whenthe bolt is thrown.

J represents the tumbler, which is of yoke form. It lies upon the sideof the bolt, and one arm K extends upon the arm D of the bolt below thecylinder B and the other arm L of the tumbler extends upon the other armF of the bolt and below the cylinder C. The arm K of the tumblers isconstructed with a projection M, which sets into a correspondingtransverse recess in the arm E of the bolt, and the lower arm L isconstructed with a like projection N, which sets into a transverserecess in the arm F, the recesses in the arms being deeper than thethickness of the projections, and the tumbler is provided with a spring0, the tendency of which is to force the tumbler upward. The tumbler isconstructed with an upward projection Pin front of the recess I of thebolt, and this projection is shorter than the recess I, so that in thenormal or up position of the tumbler, when the bolt is in the drawnposition, the projection P and the forward end of the recess I will forma notch corresponding to and within which the stump H will stand, asseen in Fig. 1, or when in the thrown position, as seen in Fig. 2, alike notch is formed at the rear of the projection P, into which thestump will stand in that position, so as to secure the bolt in eitherposition.

The projections M and N of the tumbler standing in the recesses providedfor them in the bolt operate as guides for the vertical movement of thetumbler, so that both arms will move up and down alike. Theseprojections also expose a surface of the tumbler above the respectivearms of the bolt. The upper projection M of the tumbler is in a positioncorresponding to the talon Q of the upper cylinder B, as seen in Fig. 1,so that as that cylinder is turned in the direction indicated by thearrow in Fig. 1 the talon will strike the projection M of the arm K ofthe tumbler and will depress the tumbler, as indicated in broken lines,Fig. 1, forcing the tumbler downward until the projection P stands in aline below the under side of the stump H. Then the talon will strike theforward side of the recess in which the projection M works and throw thebolt to the position indicated in Fig. 2, the projection P of thetubular escaping the stump;

but so soon as the bolt has been thus thrown and the tumbler left freethe spring of the tumbler forces it upward to take the projection Pforward of the stump H, as seen in Fig. 2, so as thereby to lock thebolt in the thrown position. The movement of the tumbler thus guided bythe projections of its two arms working in the recesses of the two armsof the bolt insures its vertical position and also retains the tumblersupon the bolt, so that the tumbler will move parallel with the bolt. Incase the second cylinder 0 is employed its talon operates upon theproject-ion N of the lower arm L of the tumbler in the same manner asdescribed for the operation of the arm Q of the upper cylinder B. Areverse movement of the cylinder to that which has been described forthrowing the bolt will operate in like manner upon the tumbler to throwit downward against the press ure of its spring and so as to permit theprojection P of the tumbler to escape the stump. Then the bolt will bedrawn and the talon of the cylinder escaping from the tumbler thetumbler will rise, as before described, and bring the projection P atthe rear of the stump, as seen in Fig. 1, so as to lock the bolt in thedrawn position. This construction of the tumbler and bolt is extremelysimple, yet mostefiective, and while especially adapted for twocylinders, one upon one side and the other upon the opposite side, so asto operate upon the respective arms of the tumblers, the yokeshapedconstruction of the tumbler and bolt described combines the tumbler andbolt, so that the tumbler is firmly supported upon the bolt, yet so freethat its up-and-down movement is easily produced, the yoke shape of thearms bringing the guides so far apart that there is noliability to crampthe tumbler in its operation, and this whether the lock be adapted fortwo cylinders or for a single cylinder.

No claim is made in this application,broadly considered,to a lock inwhich the bolt is constructed with two rearWardly-projecting arms, oneabove the other, each adapted for the operation of an independent lockmechanism and having combined therewith a tumbler arranged to beoperated by either of the said lock mechanisms to release or engage thebolt in either its thrown or drawn position, as such is a well-knownconstruction of look.

I claim- In a lock in which the bolt is adapted to be thrown by acylinder having a talon upon its inner end to engage the bolt, thecombination of the bolt constructed with two rearwardlyprojecting arms EF, one above the other, and each arm constructed with a transverserecess, a stationary stump in the case, the bolt constructed with arecess I, the ends of which are adapted to engage the correspondingsides of said stump, with a tumbler J constructed with two arms K L, thesaid arms being an integral part of the tumbler and corresponding to thetwo armsE F of the bolt and arranged thereon, the two arms of thetumbler each constructed with a projection,respectively, M

the bolt, one or both of said projections on the arms of the tumblerbeing adapted for the operation of the talon of the cylinder, while theyserve as guides for the vertical movement of the tumbler, and thetumbler constructed with a projection P upon its upper side and in frontof the recess I of the tumbler, but the said projection shorter than thesaid recess, so as to form notches in the bolt forward of and in rear ofsaid projection substantially as and for the purpose described. Intestimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

VVILLIAH E. SPARKS. \Vitnesses:

ELLIOTT LITTLEJOI-IN, l/VM. S. CooKE.

